Practice question

What is the main function of the oxygen (lambda) sensor fitted in the exhaust of a modern petrol engine?

  1. To measure engine oil level
  2. To measure oxygen in the exhaust so the ECU can adjust the air-fuel mixture for efficient combustion
  3. To measure tyre pressure
  4. To measure coolant temperature

Answer: B — To measure oxygen in the exhaust so the ECU can adjust the air-fuel mixture for efficient combustion

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